Newborn stool and stomach function The stomach function and stool characteristics of newborns are significantly different from those of adults and depend on the feeding regime. First stool (meconium): A newborn's first stool, called meconium, is a dark green or black, sticky mass. This is due to the fact that meconium is made up of waste from the uterus. Meconium is usually passed within the first 24-48 hours. Breastfeeding Stools: When breastfeeding, a newborn's stools will often be softer and yellowish-orange in color. It can be thin or buttery. In most cases, it is released once every 2-3 days, but it can be more often. Stools in the case of artificial feeding: If the baby receives artificial milk, his stools may be firmer, relatively dark. Gastric activity in newborns: Infants often have gastric activity during or shortly after feeding. It can even happen 6 to 10 times a day, but this is normal. We must pay attention: if more than 48 hours have passed since the newborn has not had a bowel movement, is fussy, or has other noteworthy symptoms, such as vomiting and bloating, if the stool is bloody or excessively watery, black or white, it is recommended to consult a pediatrician.